MOSFET-P Channel Control with Arduino - Selecting 1A P-Type Transistor for Direct 5V Drive

Question

Hello,

I need to drive a MOSFET with P type channel using arduino. The transistor should only work in two states (key). I would not like to add NPN, which will control Mosfeta, I would like to do it directly with arduino (0-5V).

I would like to ask for help which MOSFET to use for this purpose (MOSFET for about 1A current).

best regards

Xantix · Accepted Answer

If you want to use the control directly from the uC port, you must use MOSFET Logic Level, i.e. one that fully opens at 5 V. You have a lot of it in the tme catalog.

Slawek K. · Accepted Answer

Logic-level mosfets with P channel are not very popular, but there are you need SMD or THT? pozdr

landy13 · Accepted Answer

You won't turn off the 12V line with PMOS at five volts on the gate. You must give an additional transistor.

Anonymous · Accepted Answer

Exactly so, and then this P_MOS does not have to be Logic-Level, just plain because it will have a gate voltage control of 12V - and this also needs to be taken into account - because some MOSFETs have maxVgs = 10V (then make the primary stage collector resistor as a divider voltage).

Slawek K. · Accepted Answer

pozdr

Anonymous · Accepted Answer

MOS instead of BJT as a key - the advantages are always two: - low voltage drop across the transistor (and low power losses) - only dependent on the corresponding low Rdson MOSFET, - easy to control - MOSFET requires no power (BJT as a key requires a base current of 1/20 Ic) For example, using DMP2100U-7: Rdson = approx. 0.03 Ohm, for Id = 1A Uds = 0.03V, Pstrat = 0.03V x 1A = 30mW - the result cannot be obtained with any BJT.

Anonymous · Accepted Answer

Transistor as a repeater - conversion to MOSFET will do nothing or nothing.
Why load in the emitter? - useful load voltage is limited by max Uwy WO and lowered by Ube - and here the conversion to MOSFET will make matters worse, because Ugs is high.
The system will not work well, because the filtered PWM signal will give an almost constant value of the control voltage WO regardless of filling, because the WO consumes a negligible current Ibias.

JokoPS · Answer

I need Mosfeta THT

Slawek K. · Answer

This is probably one of the few logic-level THT on TME:

Anonymous · Answer

IRLU9343 There is more choice (and better) in SMD, e.g. AO3401A DMP2100U-7 IRLML6401 Using SMD is not difficult, even instead of THT.

JokoPS · Answer

I can use SMD without any problems - I will only design the board. Generally, I need PMos to turn off the computer fan (12V 4pin) using Arduino (must be disconnected +). The fan is controlled by PWM but the electronics in the fan protect it against switching off at 0% filling.

JokoPS · Answer

All in all right, I did not think that it will not drive ... In this case, I will use, for example, BC547 to control Mosfeta.

landy13 · Answer

If you use the word controls in the commonly known meaning (= = turns on), the opposite is true. The mosfet will be controlled all the time, it cannot be used turn off .

JokoPS · Answer

Well, PMos will be on all the time and turns off when voltage is applied to the gate. I made a simple layout: BC547 base through a 5k resistor for Arduino, ground emitter, collector for IRF9540 gate, source up to + 12V, drain for + fan. In addition, a 10k resistor between the gate and the source. After testing, it seems that everything works as it should. Is there such an advantage of using PMos instead of PNP in such a simple system?

JokoPS · Answer

Great, thanks a lot, everything works as it should, I still have a quick question whether in this case the application of Mosfeta will give something or leave BJT better? I have only modified the RC filter to 22uF and 5k ohm (controlled by PWM signal from arduino, supply voltage 12V, system needed to control voltage depending on filling)

JokoPS · Answer

I thought that in this case (emitter repeater) the load must be in the emitter. Is it possible to give a load in the collector in such a system? The only thing that comes to my mind that there is no voltage reduced by Ube at the output is the use of PNP and then the load in the collector. I tested this circuit and the output voltage is regulated in the range of 3.5-11V. I would like to ask for suggestions on what to recommend in such a case that everything would work ok and the regulation would take place from 2-12V.

JokoPS · Answer

In a nearby electronics I have PMOS smd available (this mosfet will be switched on by NPN BC547. Supply voltage 12V)
AP9567GH
NTD20P06L
BSP171P
IRLML9301
IRF7342

Is there a difference which of the above will apply or take the cheapest? (at the moment, the housing doesn't matter because I'm at the PCB design stage)

MOSFET-P Channel Control with Arduino - Selecting 1A P-Type Transistor for Direct 5V Drive

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Post #15

Post #16

Post #17

Post #18

Topic summary